First slide

Ionization constants of weak bases, PH of weak bases

Question

A 0.01 M ammonia solution is 5% ionised. The concentration of ${OH}^{-}$ ion is

Moderate

A

0.005 M
B

0.0001 M
C

0.0005 M
D

0.05 M

Solution

${NH}_{4} OH ⇌ {NH}_{4}^{+} + OH, α = \frac{5}{100} = 0.05$
$[{OH}^{-}] = Cα = 0.01 \times 0.05 = 0.0005 M$

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